How do I generate the json schema for a custom field in Forge

I’m using the /rest/api/3/app/field/xxxxxx/value end point.
I’m getting back:

The value does not conform to the schema: the JSON schema is invalid

Since the JSON schema is auto generated from what’s in the manifest - how can I see what’s generated?

Thanks,

/Daniel

Daniel - did you ever get a reply on this issue?